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Revisiting Stochastic Computing in the Era of Nanoscale Nonvolatile Technologies


3D Reconstruction in Canonical
Abstract


In this era of nanoscale technologies, the inherent characteristics of some nonvolatile devices, such as resistive random access memory (ReRAM), phase-change material (PCM), and spintronics, can emulate stochastic functionalities. Traditionally, these devices have been engineered to suppress the stochastic switching behavior as it poses reliability concerns for memory storage and logic applications. However, leveraging stochasticity in such devices led to a renewed interest in hardware‚??software codesign of stochastic algorithms since the CMOS-based implementations of stochastic algorithms involve cumbersome circuitry to generate ‚??stochastic bits.‚?? In this article, we consider two classes of problems: deep neural networks (DNNs) and combinatorial optimization. The rapidly growing demands of artificial intelligence (AI) have sparked an interest in energy-efficient implementations of large DNNs, with binary representations of synaptic weights and neuronal activities. Stochasticity plays an important role in leveraging the benefits of these binary representations, leading to model compression and optimization during training. In combinatorial optimization, such as graph coloring or traveling salesman problems, stochastic algorithms, such as the Ising computing model, have been shown to be effective. These problems require exhaustive computational procedures, and the Ising model uses a natural annealing agent to achieve near-optimal solutions in a reasonable timescale, without getting stuck in ‚??local minima.‚?? In this article, we present a broad review of stochastic computing utilizing the stochastic switching characteristics of devices based on nanoscale nonvolatile technologies. We show how to codesign of the devices and algorithms that can enable optimal solutions for both combinatorial problems and binary neural networks for local learning and inference. Directly mapping the nonvolatile device characteristics to the stochastic algorithms without the need for storing the bits in a separate memory leads to efficient use of hardware.

KeyWords
Combinatorial optimization, Ising spin model, neuromorphic computing, nonvolatile memory (NVM), stochastic computing, stochastic neural networks.



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